Dynamic in Situ NMR of Catalysis

南加州大学的James Haw教授的项目得到了分析和表面化学计划的支持，旨在实现对沸石和金属氧化物上发生的催化反应的基本了解。设计了一种特殊的脉冲猝灭催化反应器，可以用核磁共振波谱研究催化反应。该装置可以实时跟踪催化动力学的变化，时间分辨率为0.2.S。理论计算还用于模拟吸附、反应和光谱性质，并模拟实验核磁共振结果。本项目将研究的一个具体例子是在酸性沸石表面上乙烯催化转化为甲苯。核磁共振光谱被用来研究简单吸附气体在沸石和金属氧化物表面上催化转化为更复杂的分子。南加州大学的James Haw教授开发了一种样品引入系统，允许在此类催化系统发生变化时实时研究它们，而不是以前的方法，即需要停止反应并逐个片段地评估。这种新的分析方法将用于研究在酸化的沸石表面上乙烯转化为甲苯的重要工业意义。

The project of Professor James Haw of the University of Southern California, supported by the Analytical and Surface Chemistry Program, seeks to achieve a fundamental understanding of the catalytic reactions that occur on zeolites and metal oxides. A special pulse quench catalytic reactor has been designed that allows the investigation of catalytic reactions by nuclear magnetic resonance spectrometry. Real time changes in catalytic kinetics can be followed with this device with a time resolution of 0.2 s. Theoretical calculations are also used to model adsorption, reaction, and spectroscopic properties, and to model the experimental NMR results. A specific example that will be studied in this project is the catalytic conversion of ethylene to toluene on an acidic zeolite surface.Nuclear magnetic resonance spectrometry is used to study the catalytic transformation of simple adsorbed gases into more complex molecules on zeolite and metal oxide surfaces. Professor James Haw at the University of Southern California has developed a sample introduction system that allows such catalytic systems to be studied as they change in real time, compared to previous methods that required that the reaction be stopped and evaluated piece by piece. The new analytical method will be used to study the industrially important transformation of ethylene to toluene on an acidified zeolite surface.